Haier 2HUM18HC03/R2 Service Manual

Also see for 2HUM18HC03-R2: Installation manual Installation manual Operation manual Installation manual

2HUM18HC03/R2(DB)-SM Wiring diagrams25Domestic air conditionerWhen the outdoor unit is shut down, the valve is opened completely for 2 minutes, and thenbegin initialization.The scope of refrigerationg valve 90-----480 stepsThe scope of heating valve 80-----480 stepsThe valves are adjusted according to the degree of superheat üSHaˈƸSHa.5.2.4˖Four way controlFor the details of defrosting four-way valve control, see the defrosting process.Four way working in other ways:Under the mode of heating, open the four-way valve, when the compressor is not started orchanged to non-heating mode, make sure the compressor is stoped for 2 minutes, and thenclose the four-way valve.5.2.5 Protection function5.2.5.1˖TTC high temperature-preventing protectionOnce the machine is started, it can run TTC overheating protection of air-blowing, but air-blowingsensor malfunction must alarm after 4 minutes during which the compressor is started (during thecourse of self-detection, there’s no such limitation)Sensor detection methods: 100 times (one cycle of procedure run is one time, and about 5ms,detection method for each time: continuously sampling for 8 times, then order them and take themean value of the middle 2 values), take the mean value.TTC˄ć˅Abnormal stop110Decreasing the frequency rapidly˄1HZ/second˅100Decreasing the frequency slowly (1HZ/10seconds)98The frequency doesn’t change.93Increasing the frequency (1HZ/10second)90Increasing the frequency˄1HZ/1second˅TTC>=110ć lasts for 20 seconds. Overheating protection of air-blowing, alarm malfunction tothe indoor, others don’t last.5.2.5.2˖TC high temperature-preventing control of the indoor heating unit˖Tpg_indoor is the highest value of the effective indoor unit (start it and it is in accord with therunning state).The indoor heat exchanger sensor tests the temperature of the indoor heat exchanger. If thetemperature is higher than 55ć, decrease the rotate speed of the compressor and do the hightemperature-preventing protection of the indoor heat exchanger; if the temperature of the indoorheat exchanger is lower than 47ć, recover to the normal control.